rationalise 1/√-9-√7
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Correct Question
1/-√9 - √7
Rationalize it
Solution
Rationalize its denominator
→ 1/-√9-√7 × (-√9+√7)/(-√9+√7)
→ (-√9 + √7)/(-√9)² - (√7)²
★ Applying identity :
a² - b² = (a + b)(a - b)
→ (-√9 + √7)/9 - 7
→ (-√9 + √7)/2
→ -√9 + √7/2
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